ES2312613T3 - APPLICATION FOR PHYSICAL LAYER AUTOMATIC REPETITION. - Google Patents
APPLICATION FOR PHYSICAL LAYER AUTOMATIC REPETITION. Download PDFInfo
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- ES2312613T3 ES2312613T3 ES02761439T ES02761439T ES2312613T3 ES 2312613 T3 ES2312613 T3 ES 2312613T3 ES 02761439 T ES02761439 T ES 02761439T ES 02761439 T ES02761439 T ES 02761439T ES 2312613 T3 ES2312613 T3 ES 2312613T3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
- H04L1/0034—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter where the transmitter decides based on inferences, e.g. use of implicit signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1809—Selective-repeat protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1835—Buffer management
- H04L1/1845—Combining techniques, e.g. code combining
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0096—Channel splitting in point-to-point links
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Mobile Radio Communication Systems (AREA)
- Communication Control (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Small-Scale Networks (AREA)
- Radio Relay Systems (AREA)
Abstract
Método para ajustar la modulación de datos en un sistema de comunicación inalámbrica, método comprendiendo: la recepción de datos en un transmisor (12) para la transmisión a un receptor (16); el formateo de los datos recibidos en paquetes para la transmisión al receptor (16); cada paquete teniendo una codificación particular y una modulación de datos particular; la transmisión de los paquetes al receptor (16); la recepción de los paquetes en el receptor (16); para cada paquete recibido, generación y transmisión de un acuse de recibo en la capa física a través de un canal de retroacción rápida, si el paquete recibido tiene una tasa de errores aceptable, donde los acuses de recibo son transmitidos en el canal de retroacción rápida mediante el uso de una interfaz aérea de acceso múltiple por división de códigos, llamada CDMA a continuación; la retransmisión de este paquete recibido en el transmisor, si no se recibe ningún acuse de recibo para este paquete; la recogida de estadísticas de retransmisión (60) mediante la recogida del número de casos de retransmisión; y el ajuste de cada codificación particular y modulación de datos particular (62) mediante el uso de la recogida de estadísticas de retransmisión, donde la codificación particular y modulación de datos particular son una codificación de corrección progresiva de errores, llamada FEC a continuación, y una modulación de datos, y el método es caracterizado por el hecho de que los paquetes son transmitidos mediante el uso de una interfaz aérea de acceso múltiple por división de frecuencia ortogonal, llamada OFDMA a continuación, y de que, además del ajuste de la codificación FEC particular y de la modulación de datos particular, una puesta a cero selectiva de subcanales en un conjunto OFDMA es realizada.Method for adjusting data modulation in a wireless communication system, method comprising: receiving data in a transmitter (12) for transmission to a receiver (16); formatting the data received in packets for transmission to the receiver (16); each packet having a particular coding and a particular data modulation; the transmission of the packets to the receiver (16); the reception of the packets at the receiver (16); for each packet received, generation and transmission of an acknowledgment in the physical layer through a fast feedback channel, if the received packet has an acceptable error rate, where the acknowledgments are transmitted in the quick feedback channel through the use of an aerial multiple access interface by code division, called CDMA below; the retransmission of this packet received at the transmitter, if no acknowledgment is received for this packet; the collection of retransmission statistics (60) by collecting the number of retransmission cases; and the adjustment of each particular coding and modulation of particular data (62) through the use of the collection of retransmission statistics, where the particular coding and modulation of particular data are a coding of progressive error correction, called FEC below, and a data modulation, and the method is characterized by the fact that packets are transmitted by using an orthogonal frequency division multiple access aerial interface, called OFDMA below, and that, in addition to the coding adjustment Particular FEC and of the particular data modulation, a selective zeroing of subchannels in an OFDMA set is performed.
Description
Solicitud de repetición automática de capa física.Automatic layer repeat request physical.
La invención presente se refiere a sistemas de comunicación inalámbricos. Más particularmente, se refiere a una modificación para tales sistemas utilizando un esquema (ARQ) de solicitud de repetición automática de capa física (PRY).The present invention relates to systems of Wireless communication More particularly, it refers to a modification for such systems using a scheme (ARQ) of request for automatic repetition of physical layer (PRY).
Sistemas de comunicación (BFWA) de acceso inalámbrico fijo de un ancho de banda propuestos, mediante el uso de una ecualización de un único dominio de portador- frecuencia (SC-FDE) o un plano multiplex con división de frecuencia ortogonal (OFDM) mediante el uso de una aplicación de enlace descendente de paquetes a alta velocidad (HSDPA). Esta aplicación transmitirá datos de paquetes de enlace descendente a alta velocidad. En BFWA, una construcción o grupo de construcciones están conectados, sea de forma inalámbrica o por cable, y funcionan como un único sitio de abonado. La demanda de datos para este tipo de sistema es bastante alta para los usuarios finales múltiples de único sitio que requiere grandes anchos de banda.Access communication systems (BFWA) Fixed wireless of a proposed bandwidth, by using of an equalization of a single carrier-frequency domain (SC-FDE) or a multiplex plane with division of orthogonal frequency (OFDM) by using an application of High speed packet downlink (HSDPA). This application will transmit downlink packet data to high speed. In BFWA, a construction or group of constructions they are connected, either wirelessly or by cable, and they work as a single subscriber site. The demand for data for this type system is quite high for multiple end users of Only site that requires large bandwidths.
El sistema habitual propuesto emplea un sistema (ARQ) de solicitud de repetición automática desde la capa 2. Los bloques de datos transmitidos sin éxito a los abonados son introducidos en una memoria tampón y retransmitidos desde la capa 2. Los bloques de datos almacenados en la capa 2 son generalmente grandes y transmitidos para una alta recepción de relación señal ruido (SNR), éstos son recibidos con una tasa de errores de bloque (BLER) baja, y son retransmitidos con poca frecuencia. Por otra parte, la señalización ARQ de la capa 2 es generalmente lenta y requiere grandes tampones y largos intervalos de retransmisión.The proposed usual system employs a system (ARQ) request for automatic repetition from layer 2. The blocks of data transmitted unsuccessfully to subscribers are introduced in a buffer and retransmitted from the layer 2. The blocks of data stored in layer 2 are generally Large and transmitted for high signal ratio reception noise (SNR), these are received with a block error rate (BLER) low, and they are retransmitted infrequently. For other part, the ARQ signaling of layer 2 is generally slow and It requires large buffers and long retransmission intervals.
WO 99/12303A se refiere a una manipulación de errores mediante el uso de ARQ en sistemas de comunicación digitales que soportan unos esquemas de codificación de corrección progresiva de errores múltiples (FEC) y/o de modulación.WO 99 / 12303A refers to a handling of errors by using ARQ in communication systems digitals that support correction coding schemes progressive multiple errors (FEC) and / or modulation.
Para proveer flexibilidad en términos de segmentación de bloques o de ajustes de tasa de bits del usuario, una o las dos, modulación y codificación de FEC usadas para preparar la información para la transmisión puede ser ajustada para los bloques que deben ser retransmitidos. En particular, una resegmentación flexible o mapeo de bloques de información está asociada a unos cambios en una o las dos, codificación FEC y modulación usadas para retransmitir estos bloques.To provide flexibility in terms of block segmentation or user bit rate settings, one or both, modulation and coding of FEC used to Prepare the information for transmission can be adjusted to the blocks that must be retransmitted. In particular, a flexible resegmentation or mapping of information blocks is associated with changes in one or both, FEC coding and modulation used to relay these blocks.
Un sistema de repetición de solicitud automático físico comprende un transmisor y un receptor. Un transmisor de capa física, en el transmisor, recibe datos y formatea los datos recibidos en paquetes que tienen una codificación particular y una modulación de datos particular. El transmisor de capa física contiene n canales que transmiten los paquetes y retransmite paquetes en respuesta al hecho de no recibir un acuse de recibo correspondiente para un paquete determinado donde los acuses de recibo son transmitidos en el canal de retroacción rápida mediante el uso de una interfaz aérea de acceso múltiple por división de códigos (CDMA). Un controlador de modulación y codificación adaptativas en el transmisor recoge las estadísticas de retransmisión mediante la recogida del número de casos de retransmisión y ajusta la codificación particular y las modulaciones de datos particulares usando las estadísticas recogidas donde la codificación particular y la modulación de datos particular son una codificación de corrección progresiva de errores (FEC) y una modulación de datos y los paquetes son transmitidos mediante el uso de una interfaz aérea de acceso múltiple por división de frecuencia ortogonal (OFDMA) y el ajuste de codificación FEC particular y de modulación de datos particular es realizada también para una puesta a cero selectiva de subcanales en un conjunto OFDMA. El receptor tiene un receptor de n canales de capa física para la recepción de los paquetes. El receptor comprende un combinador ARQ híbrido y un descodificador de n canales que combina las transmisiones de paquetes, descodifica los paquetes y detecta los errores de paquete. El receptor contiene un transmisor de acuse de recibo que transmite un acuse de recibo a cada paquete, si ese paquete tiene una tasa de errores aceptable en un canal de retroacción rápida usando una interfaz aérea COMA, donde la codificación particular y la modulación de datos particular es una codificación FEC y una modulación de datos y los paquetes son transmitidos mediante el uso de una interfaz aérea OFDMA y el ajuste de codificación FEC particular y de modulación de datos particular se realiza también para una puesta a cero selectiva de subcanales en un grupo OFMDA. El receptor contiene un elemento de entrega sin secuencia que entrega paquetes aceptables en capas más altas.An automatic request repeat system Physical comprises a transmitter and a receiver. A layer transmitter physical, in the transmitter, receives data and formats the data received in packages that have a particular coding and a particular data modulation. The physical layer transmitter It contains n channels that transmit the packets and retransmits packages in response to the fact of not receiving an acknowledgment of receipt corresponding for a particular package where the accusations of receipt are transmitted on the fast feedback channel by the use of an aerial multiple access interface by division of codes (CDMA). A modulation and coding controller adaptive in the transmitter collects the statistics of retransmission by collecting the number of cases of retransmission and adjusts the particular coding and modulations of particular data using statistics collected where particular coding and data modulation particular are a progressive error correction coding (FEC) and a data modulation and packets are transmitted by using an aerial multiple access interface by orthogonal frequency division (OFDMA) and adjustment of particular FEC coding and particular data modulation is also performed for selective zeroing of subchannels in an OFDMA set. The receiver has a receiver of n channels of physical layer for receiving packages. The receptor it comprises a hybrid ARQ combiner and a decoder of n channels that combines packet transmissions, decodes the packages and detects package errors. The receiver contains a acknowledgment transmitter that transmits an acknowledgment to each package, if that package has an acceptable error rate in a fast feedback channel using a COMA air interface, where the particular coding and the particular data modulation is an FEC encoding and a data modulation and the packages are transmitted through the use of an OFDMA air interface and the setting of particular FEC coding and data modulation particular is also done for a selective zeroing of subchannels in an OFMDA group. The receiver contains an element of Sequence-free delivery that delivers acceptable packages in more layers high.
Las figuras 1a y 1b son diagramas de bloque simplificados de ARQs físicas de enlace descendente y ascendente.Figures 1a and 1b are block diagrams. simplified downlink physical ARQs and upward.
La figura 2 es un diagrama de flujo para el uso de estadísticas de retransmisión para una modulación y codificación adaptativas.Figure 2 is a flow chart for use. of relay statistics for modulation and coding adaptive
La figura 3 es un diagrama de bloques mostrando una parada de canales múltiples y una arquitectura de espera.Figure 3 is a block diagram showing a multi-channel stop and a waiting architecture.
Las figuras 1a y 1b muestran respectivamente un ARQ 10 físico de enlace descendente y un ARQ 20 físico de enlace ascendente.Figures 1a and 1b show respectively a ARQ 10 physical downlink and a physical ARQ 20 link upward.
La ARQ 10 física de enlace descendente comprende una estación de base 12 de recepción de paquetes desde el transmisor de ARQ 14a desde la capa más alta provista en la red 14. Los paquetes desde el transmisor 14a son aplicados al transmisor de ARQ 12a de capa física en la estación de base 12. El transmisor de ARQ 12a codifica los datos con un código de corrección progresiva de errores (FEC), añade secuencias de control de errores (ECSs), modula los datos dirigidos por el controlador (AMC) 12c de modulación y de codificación adaptativas, tal como mediante el uso de una clave de desplazamiento de fase binaria (BPSK), clave de desplazamiento de cuadratura de fase (QPSK) o modulación de amplitud de cuadratura m-ava (es decir, 16-QAM o 64-QAM). Adicionalmente, para un acceso múltiple de división de frecuencia ortogonal (OFDMA), el controlador AMC 12a puede variar los subcanales usados para transportar los datos de paquetes. El transmisor 12a de ARQ de capa física transmite paquetes a la unidad de abonado 16 a través de una interfaz aérea 14 por medio de un interruptor, circulador o duplexor 12d y una antena 13. El transmisor 12a almacena también temporalmente el mensaje para la retransmisión, en caso de necesidad, en una memoria tampón incorporada en el transmisor 12a.The physical downlink ARQ 10 comprises a base station 12 receiving packets from the ARQ transmitter 14a from the highest layer provided in network 14. The packets from the transmitter 14a are applied to the transmitter of ARQ 12a of physical layer at base station 12. The transmitter of ARQ 12a encodes the data with a progressive correction code of errors (FEC), add error control sequences (ECSs), modulates the data directed by the controller (AMC) 12c of adaptive modulation and coding, such as through use of a binary phase shift key (BPSK), key of phase quadrature shift (QPSK) or modulation of amplitude of quadrature m-ava (i.e. 16-QAM or 64-QAM). Further, for multiple orthogonal frequency division access (OFDMA), the AMC 12a controller may vary the subchannels used to transport packet data. ARQ transmitter 12a of physical layer transmits packets to subscriber unit 16 through of an air interface 14 by means of a switch, circulator or 12d duplexer and an antenna 13. The transmitter 12a also stores temporarily the message for retransmission, in case of need, in a buffer memory built into the transmitter 12th
La antena 15 de la unidad de abonado 16 recibe el paquete. El paquete es introducido en un receptor ARQ 16a de capa física a través de un interruptor, circulador o duplexor 16b. En el receptor 16a, el paquete es descodificado y controlado por FEC para detectar errores usando el ECS. El receptor 16a controla después el transmisor de acuse de recibo 16c para acusar recibo (ACK) de un paquete con una tasa de errores aceptable o bien para solicitar una retransmisión preferiblemente, por medio de la retención de una señal de acuse de recibo o de transmisión de un acuse de recibo negativo (NAK).The antenna 15 of the subscriber unit 16 receives the package. The package is introduced in an ARQ 16a receiver of physical layer through a switch, circulator or duplexer 16b. At receiver 16a, the packet is decoded and controlled by FEC to detect errors using the ECS. The 16th receiver controls after the acknowledgment transmitter 16c to acknowledge receipt (ACK) of a package with an acceptable error rate or for request a retransmission preferably, through the retention of an acknowledgment or transmission signal of a negative acknowledgment (NAK).
El ACK es enviado por un transmisor de ACK 16c a la estación de base 12 a través de un interruptor 16b y de una antena 15. El ACK es enviado a través de la interfaz aérea 14 a una antena 13 de una estación de base 12. El ACK recibido es tratado por un receptor de acuse de recibo 12b en la estación de base. El receptor de ACK 12b entrega el ACK/NAKs al controlador (AMC) 12c de modulación y codificación adaptativas y al transmisor 12a. El controlador de AMC 12c analiza la calidad del canal de la unidad de abonado 16 mediante el uso de estadísticas de los ACKs recibidos y puede variar las técnicas de codificación FEC y de modulación de transmisiones posteriores del mensaje, como se describirá con más detalle. Si la unidad de abonado 16 acusa recibo del paquete, la recepción de este ACK en la estación de base 12 hace que el paquete original, que fue temporalmente almacenado en una memoria tampón, sea borrado y esté disponible para el siguiente paquete.The ACK is sent by an ACK 16c transmitter to the base station 12 through a switch 16b and a antenna 15. The ACK is sent through the air interface 14 to a antenna 13 of a base station 12. The received ACK is treated by an acknowledgment receiver 12b at the base station. He ACK receiver 12b delivers the ACK / NAKs to controller (AMC) 12c of adaptive modulation and coding and transmitter 12a. He AMC 12c controller analyzes the channel quality of the unit subscriber 16 by using statistics of the ACKs received and FEC coding and modulation techniques may vary. subsequent message transmissions, as will be described with more detail. If the subscriber unit 16 acknowledges receipt of the package, the Receiving this ACK at base station 12 makes the package original, which was temporarily stored in a buffer, be deleted and available for the next package.
Si no se recibe ningún ACK o si se recibe un NAK, el transmisor de capa física 12a retransmite al abonado 16 el mensaje original o la versión modificada selectivamente del mensaje original. En la unidad de abonado 16, la retransmisión es combinada con la transmisión original, si está disponible. Esta técnica facilita la recepción de un mensaje adecuado mediante el uso de una redundancia de datos o combinación de repetición selectiva. Los paquetes con una tasa de errores aceptable son transferidos a unas capas más altas 16d para un tratamiento adicional. Los paquetes recibidos aceptables son entregados a las capas más altas 16d en el mismo orden de datos en el que los datos fueron proporcionados al transmisor 12a en la estación de base (es decir, en una entrega en secuencia). El número máximo de retransmisiones es limitado a un valor entero definido por el operador, tal como en la gama de 1 a 8. Después de intentar obtener el número máximo de retransmisiones, la memoria tampón es borrada para un uso por el siguiente paquete. La descodificación de un acuse de recibo mediante el uso de paquetes pequeños en la capa física reduce los retrasos de transmisión y el tiempo de manipulación del mensaje.If no ACK is received or if a NAK, the physical layer transmitter 12a relays the subscriber 16 the original message or the selectively modified version of the message original. In the subscriber unit 16, the retransmission is combined with the original transmission, if available. This technique facilitates the reception of an appropriate message by using a data redundancy or selective repeat combination. The packages with an acceptable error rate are transferred to about 16d higher layers for additional treatment. The packages Acceptable receipts are delivered to the highest layers 16d in the same order of data in which the data was provided to the 12a transmitter at the base station (that is, on a delivery in sequence). The maximum number of retransmissions is limited to one integer value defined by the operator, such as in the range of 1 to 8. After trying to get the maximum number of retransmissions, The buffer is deleted for use by the following package. The decoding of an acknowledgment by using Small packages in the physical layer reduces delays of Transmission and message handling time.
Puesto que la ARQ PHY se produce en la capa física, el número de Casos de retransmisión para un canal particular, estadísticas de retransmisión, es una buena medida de esta calidad de canal. Mediante el uso de las estadísticas de retransmisión, el controlador AMC 12c puede variar los esquemas de modulación y de codificación para este canal, como se muestra en la figura 2. Por otra parte, las estadísticas de retransmisión pueden estar combinadas también con otras mediciones de calidad de enlace, como unas tasas de errores de bits (BERs) y tasas de errores de bloques (BLERs), por el controlador AMC 12c para medir la calidad del canal y determinar si un cambio en el esquema de modulación y de codificación es necesario.Since the ARQ PHY is produced in the layer Physical, the number of Relay Cases for a channel particular, relay statistics, is a good measure of This channel quality. By using the statistics of Relay, the AMC 12c controller can vary the schemes of modulation and coding for this channel, as shown in the Figure 2. On the other hand, relay statistics can be combined with other link quality measurements, such as bit error rates (BERs) and error rates of blocks (BLERs), by the AMC 12c controller to measure quality of the channel and determine if a change in the modulation scheme and Coding is necessary.
Para ilustrar el SC-FDE, los casos de retransmisión para un canal particular son medidos para producir estadísticas de retransmisión, (60). Una decisión para saber si se debe cambiar el esquema de modulación se ha realizado usando las estadísticas de retransmisión, (62). Si las retransmisiones son excesivas, se utiliza un esquema de codificación y de modulación más resistente, (64), normalmente en un nivel de transferencia de datos reducido. El controlador AMC 12c puede aumentar el factor de dispersión y usar más códigos para transferir los datos de los paquetes. Alternativa o adicionalmente, el controlador AMC puede pasar de un esquema alto de modulación de transferencia de datos a uno más bajo, tal como de 64-QAM a 16-QAM o QPSK. Si la tasa de retransmisiones es baja, se realiza un cambio a un esquema de modulación de capacidad más elevada, tal como de QPSK a QAM 16-ava o QAM 64-ava, (66). La decisión preferiblemente usa el nivel de retransmisión y otras mediciones de calidad de conexión señaladas desde el receptor, tal como BER o BLER, (62). Los límites de decisión son preferiblemente determinados por el operador del sistema.To illustrate the SC-FDE, the Relay cases for a particular channel are measured to produce relay statistics, (60). A decision for know if the modulation scheme should be changed has been performed using relay statistics, (62). If the retransmissions are excessive, a scheme of more resistant coding and modulation, (64), usually in a reduced level of data transfer. The AMC 12c controller you can increase the scatter factor and use more codes to Transfer packet data. Alternatively or additionally, the AMC controller can go from a high modulation scheme of data transfer to a lower one, such as 64-QAM to 16-QAM or QPSK. If the rate of retransmissions is low, a change is made to a scheme of higher capacity modulation, such as from QPSK to QAM 16-ava or QAM 64-ava, (66). The decision preferably uses the retransmission level and other connection quality measurements indicated from the receiver, such as BER or BLER, (62). The decision limits are preferably determined by the system operator.
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Para OFDMA, los casos de retransmisión son utilizados para controlar la calidad del canal de cada subcanal. Si la tasa de retransmisión o calidad de tasa/conexión de retransmisión para un subcanal particular indica una mala calidad, ese subcanal es selectivamente puesto a cero desde el conjunto de frecuencia OFDM, (64), para excluir el uso de tales subcanales de mala calidad en algún periodo futuro. Si la tasa de retransmisión o calidad de tasa/conexión de retransmisión indica una alta calidad, unos subcanales previamente puestos a cero, son añadidos de nuevo al conjunto de frecuencia OFDM, (66).For OFDMA, the retransmission cases are used to control the channel quality of each subchannel. Yes the retransmission rate or rate / connection quality of Relay for a particular subchannel indicates poor quality, that subchannel is selectively zeroed from the set of OFDM frequency, (64), to exclude the use of such subchannels of Bad quality in some future period. If the retransmission rate or Relay rate / connection quality indicates high quality, Subchannels previously set to zero are added again to the OFDM frequency set, (66).
El uso de las casos de retransmisión como base para el AMC proporciona una flexibilidad para combinar el esquema de modulación y codificación con las condiciones de canal de promedio para cada usuario. Por otra parte, la tasa de retransmisión es insensible al error de medición y al retraso del informe de la unidad de abonado 16.The use of retransmission cases as a basis for the AMC provides flexibility to combine the scheme of modulation and coding with the channel conditions of Average for each user. Moreover, the rate of retransmission is insensitive to the measurement error and the delay of the subscriber unit report 16.
El ARQ de enlace ascendente 20 tiene una naturaleza similar al ARQ de enlace descendente 10 y comprende una unidad de abonado 26 donde los paquetes de un transmisor de ARQ 28a de capa más alta de las capas más altas 28 son transferidos al transmisor 26a de ARQ de capa física. El mensaje es transmitido a la antena de la estación de base a través de un interruptor 26d, una antena de abonado 25 y una interfaz aérea 24. El controlador AMC, de la misma manera, puede variar el esquema de modulación y codificación usando las estadísticas de retransmisión de un canal.The uplink ARQ 20 has a nature similar to downlink ARQ 10 and comprises a subscriber unit 26 where packages of an ARQ 28a transmitter highest layer of the highest layers 28 are transferred to the 26a transmitter of physical layer ARQ. The message is transmitted to the base station antenna through a switch 26d, a subscriber antenna 25 and an air interface 24. The controller AMC, in the same way, the modulation scheme can vary and coding using the relay statistics of a channel.
El receptor 22a de ARQ de capa física, similar al receptor 16a de la figura la, determina si el mensaje tiene una tasa de errores aceptable que requiere una retransmisión. El estado de informes del transmisor de acuse de recibo para una unidad de abonado 26, que hace que el transmisor 26a retransmita o de forma alternativa borre el mensaje original almacenado temporalmente en el transmisor 26a disponible para recibir el siguiente mensaje de las capas más altas 28. Los paquetes recibidos son enviados de forma exitosa a la red 24 para un tratamiento adicional.The similar physical layer ARQ receptor 22a to receiver 16a of figure la, determines if the message has a Acceptable error rate that requires retransmission. The state of acknowledgment transmitter reports for a unit of subscriber 26, which causes transmitter 26a to retransmit or form alternatively delete the original message temporarily stored in the 26a transmitter available to receive the following message from the highest layers 28. The received packages are sent from Successful way to network 24 for additional treatment.
Aunque no se haya mostrado por motivos de simplicidad, el sistema es empleado preferiblemente para una aplicación de HSDPA en un sistema BFWA, aunque se pueden usar otras aplicaciones. El sistema BFWA puede emplear un dúplex por división de frecuencia o un dúplex por división de tiempo SC-FDE o OFDMA. En tal sistema, la estación de base y todos los abonados se encuentran en ubicaciones fijas. El sistema puede comprender una estación de base y un gran número de unidades de abonado. Cada unidad de abonado puede servir para varios usuarios dentro de una construcción o de varias construcciones vecinas, por ejemplo. Estas aplicaciones requieren típicamente un amplio ancho de banda debido al gran número de usuarios finales en un sitio de una unidad de abonado.Although not shown for reasons of simplicity, the system is preferably used for a HSDPA application on a BFWA system, although other ones can be used Applications. The BFWA system can use a division duplex of frequency or a duplex by time division SC-FDE or OFDMA. In such a system, the base station and all subscribers are in fixed locations. The system can comprise a base station and a large number of units Subscriber Each subscriber unit can serve several users within a construction or several constructions neighbors, for example. These applications typically require a broad bandwidth due to the large number of end users in a site of a subscriber unit.
Una ARQ PHY desplegada en tal sistema es transparente en las capas más altas, tales como los controladores de acceso medio (MACs). El resultado es que la ARQ PHY puede ser usada en conjunto con ARQs de capa más alta, tal como una capa 2. En estos casos, la ARQ PHY reduce la retransmisión por encima de las ARQs de capa más alta.An ARQ PHY deployed in such a system is transparent in higher layers, such as controllers medium access (MACs). The result is that the ARQ PHY can be used in conjunction with higher layer ARQs, such as a layer 2. In these cases, the ARQ PHY reduces retransmission above the highest layer ARQs.
La figura 3 es una ilustración de una parada de N canales y de una arquitectura de espera para una ARQ PHY 30. La función de transmisión de ARQ de capa física 38 puede estar situada en la estación de base, unidad de abonado o en las dos, dependiendo de las ARQs PHY usadas, de enlace descendente, ascendente o las dos. Unos bloques 34a de datos proceden de la red. Los bloques de red están colocados en una cola 34 para una transmisión sobre el canal de datos 41 de la interfaz aérea 43. Un secuenciador 36de N canales envía datos de los bloques en secuencia a los N transmisores 40-1 a 40-n. Cada transmisor 40-1 a 40-n está asociado con una secuencia de transmisión en el canal de datos 41. Cada transmisor 40-1 a 40-n de FEC codifica y proporciona ECS para que los datos de bloque produzcan paquetes para una modulación y transmisión de AMC en el canal de datos 41. Los datos codificados FEC/ECS son almacenados en un tampón del transmisor 40-1 a 40-n para una retransmisión eventual. Por otra parte, la información de control es enviada desde el transmisor ARQ PHY 38 para sincronizar la recepción, desmodulación y descodificación en los receptores 46-1 a 46-n.Figure 3 is an illustration of a stop of N channels and a standby architecture for an ARQ PHY 30. The physical layer ARQ transmission function 38 may be located at the base station, subscriber unit or both, depending of the PHY ARQs used, downlink, uplink or two. Some blocks 34a of data come from the network. The blocks of network are placed in a queue 34 for a transmission on the data channel 41 of the air interface 43. An N sequencer 36 channels send data from the blocks in sequence to the N transmitters 40-1 to 40-n. Each transmitter 40-1 to 40-n is associated with a transmission sequence in data channel 41. Each transmitter 40-1 to 40-n of FEC codes and provides ECS for block data to produce packets for a modulation and transmission of AMC in the data channel 41. The FEC / ECS encoded data is stored in a buffer of the 40-1 to 40-n transmitter for a eventual retransmission. Moreover, the control information is sent from the ARQ PHY 38 transmitter to synchronize the reception, demodulation and decoding in the receivers 46-1 to 46-n.
Cada uno de los receptores N 46-1 a 46-n recibe el paquete en su intervalo de tiempo asociado. El paquete recibido es enviado a un descodificador de ARQ híbrido respectivo 50-1 a 50-n (50). El descodificador de ARQ híbrido 50 determina la tasa de errores, tal como BER o BLER, para el paquete recibido. Si el paquete tiene una tasa de errores aceptable, es liberado en los niveles más altos para otro tratamiento y un ACK es enviado por el transmisor de ACK 54. Si la tasa de errores es inaceptable o no se ha recibido ningún paquete, no se envía ningún ACK pero sí un NAK. Unos paquetes con tasas de errores inaceptables son introducidos en una memoria tampón en el descodificador 50 para una combinación potencial con un paquete retransmitido.Each of the N receivers 46-1 to 46-n receives the package in its associated time interval. The received package is sent to a 50-1 a respective hybrid ARQ decoder 50-n (50). The hybrid ARQ decoder 50 Determine the error rate, such as BER or BLER, for the package received. If the package has an acceptable error rate, it is released at the highest levels for another treatment and an ACK is sent by the ACK 54 transmitter. If the error rate is Unacceptable or no package received, no shipment is sent ACK but yes a NAK. Packages with unacceptable error rates they are introduced into a buffer memory in decoder 50 to a potential combination with a retransmitted packet.
Un enfoque para combinar paquetes usando códigos turbo está indicado a continuación. Si un paquete codificado turbo es recibido con una tasa de errores inaceptable, los datos de paquete son retransmitidos para facilitar una combinación de códigos. El paquete que contiene los mismos datos es codificado de manera diferente. Para descodificar los datos de paquete, ambos paquetes son procesados por el descodificador turbo para recuperar los datos originales. Como el segundo paquete tiene una codificación diferente, sus símbolos variables son mapeados en distintos puntos en el esquema de descodificación. El uso de dos paquetes con una codificación diferente añade una diversidad de codificación y una diversidad de transmisión para mejorar la BER global. Según otro enfoque, la señal idéntica es transmitida. Los dos paquetes recibidos son combinados mediante el uso de una tasa máxima de combinación de símbolos. La señal combinada es posteriormente descodificada.An approach to combining packages using codes turbo is indicated below. If a turbo coded package is received with an unacceptable error rate, data from package are retransmitted to facilitate a combination of codes The package containing the same data is encoded from different way. To decode the packet data, both packets are processed by the turbo decoder to retrieve The original data. As the second package has a different coding, its variable symbols are mapped in different points in the decoding scheme. The use of two packages with a different encoding adds a diversity of coding and a diversity of transmission to improve BER global. According to another approach, the identical signal is transmitted. The Two received packages are combined by using a fee Maximum combination of symbols. The combined signal is subsequently decoded.
El ACK para cada receptor 46-1 a 46-n es enviado a un canal de retroacción rápida (FFC) 45. El canal de retroacción rápida 45 es preferiblemente un canal de baja latencia. Para un sistema dúplex por división de tiempo, los ACKs pueden ser enviados en períodos de reposo entre transmisiones ascendentes y descendentes. El FFC 45 es preferiblemente un canal CDMA de velocidad baja, de gran ancho de banda superpuesto a otras transmisiones al interior de la banda. Los códigos y modulaciones de CDMA de FFC son seleccionados para minimizar la interferencia en otras transmisiones al interior de la banda. Para aumentar la capacidad de tal FFC 45, unos códigos múltiples pueden ser usados.The ACK for each receiver 46-1 a 46-n is sent to a fast feedback channel (FFC) 45. The fast feedback channel 45 is preferably a low latency channel. For a duplex system by division of time, the ACKs can be sent in rest periods between ascending and descending transmissions. The FFC 45 is preferably a low speed, wide width CDMA channel of band superimposed on other transmissions inside the band. FFC CDMA codes and modulations are selected for minimize interference in other transmissions within the band. To increase the capacity of such FFC 45, some codes Multiple can be used.
El receptor de ACK 56 detecta los ACKs e indica al transmisor correspondiente 40-1 a 40-n si se ha recibido el ACK. Si no se ha recibido el ACK, el paquete es retransmitido. El paquete retransmitido puede tener una modulación diferente y un esquema de codificación dirigido por el controlador AMC 12c, 26c. Si se recibe el ACK, el transmisor 40-1 a 40-n borra el paquete anterior del tampón y acepta un paquete posterior para su transmisión.The ACK 56 receiver detects ACKs and indicates to the corresponding transmitter 40-1 a 40-n if the ACK has been received. If it has not been received ACK, the packet is retransmitted. The retransmitted packet can have a different modulation and coding scheme Directed by the AMC 12c, 26c controller. If ACK is received, the 40-1 to 40-n transmitter erases the previous buffer package and accept a subsequent package for your transmission.
El número de transmisores y receptores N se basa en varios estudios de diseño, tales como la capacidad del canal y el tiempo de respuesta de un ACK. Para el sistema preferido descrito previamente, se utiliza preferiblemente una arquitectura de 2 canales, con transmisores y receptores pares e impares.The number of transmitters and receivers N is based in several design studios, such as channel capacity and the response time of an ACK. For the preferred system described previously, an architecture is preferably used 2-channel, with odd and even transmitters and receivers.
La técnica de ARQ PHY de la forma de realización preferida proporciona un aumento de 7 db en la relación señal/ruido (SNR) en comparación con un sistema en el que se usa sólo una ARQ de capa más alta. Esto se produce con el uso de tasas de errores de bloque (BLERs) más altas (5-20% de BLER) y el uso de tamaños de bloque más pequeños para una capa 1 que es práctica con una sola ARQ de capa más alta. El requisito de la SNR reducida permite tener: una capacidad aumentada por activación en una modulación de orden elevada utilizando una técnica (AMC) de modulación y codificación adaptativas; unos costes de equipo de premisa de cliente (CPE) más bajos mediante el uso de componentes de RF (radiofrecuencia) de nivel inferior, con la compensación de la ARQ PHY para un rendimiento de implementación reducido; una tasa de enlace descendente aumentada que extiende el radio celular; una potencia de enlace descendente reducida en la estación de base (BS) para minimizar la interferencia de célula a célula; y un retroceso de amplificador de potencia incrementada (PA) durante el uso de una técnica de portadores múltiples.The ARQ PHY technique of the embodiment preferred provides a 7 db increase in signal to noise ratio (SNR) compared to a system in which only one ARQ of higher layer This occurs with the use of error rates of Highest block (BLERs) (5-20% of BLER) and the use of smaller block sizes for a layer 1 that is practical with a single higher layer ARQ. The reduced SNR requirement allows to have: an increased capacity by activation in a high order modulation using a technique (AMC) of adaptive modulation and coding; equipment costs of lower customer premise (CPE) through the use of components RF (radiofrequency) of lower level, with the compensation of the ARQ PHY for reduced implementation performance; a tax increased downlink that extends the cellular radius; a reduced downlink power at the base station (BS) to minimize cell to cell interference; and a pullback of increased power amplifier (PA) while using a multi carrier technique.
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Claims (25)
- \quadquad
- la recepción de datos en un transmisor (12) para la transmisión a un receptor (16); el formateo de los datos recibidos en paquetes para la transmisión al receptor (16);the reception of data in a transmitter (12) for transmission to a receiver (16); formatting of received data in packets for transmission to the receiver (16);
- \quadquad
- cada paquete teniendo una codificación particular y una modulación de datos particular;each package having a particular coding and a particular data modulation;
- \quadquad
- la transmisión de los paquetes al receptor (16);the transmission of the packets to the receiver (16);
- \quadquad
- la recepción de los paquetes en el receptor (16);Receiving packages at the receiver (16);
- \quadquad
- para cada paquete recibido, generación y transmisión de un acuse de recibo en la capa física a través de un canal de retroacción rápida, si el paquete recibido tiene una tasa de errores aceptable, donde los acuses de recibo son transmitidos en el canal de retroacción rápida mediante el uso de una interfaz aérea de acceso múltiple por división de códigos, llamada CDMA a continuación;For each package received, generation and transmission of an acknowledgment in the physical layer through a channel of Fast feedback, if the received package has a fee of Acceptable errors, where acknowledgments are transmitted in the fast feedback channel by using an interface Multiple access aerial by code division, called CDMA a continuation;
- \quadquad
- la retransmisión de este paquete recibido en el transmisor, si no se recibe ningún acuse de recibo para este paquete;the retransmission of this packet received in the transmitter, if no acknowledgment is received for this package;
- \quadquad
- la recogida de estadísticas de retransmisión (60) mediante la recogida del número de casos de retransmisión; yCollection of relay statistics (60) by collecting the number of retransmission cases; Y
- \quadquad
- el ajuste de cada codificación particular y modulación de datos particular (62) mediante el uso de la recogida de estadísticas de retransmisión,the setting of each particular coding and particular data modulation (62) through the use of collection of relay statistics,
- \quadquad
- un transmisor (12) que tiene:a transmitter (12) that has:
- un transmisor de capa física (12a) para recibir datos, el formateo de los datos recibidos en paquetes, cada paquete comprendiendo una codificación particular y una modulación de datos particular, la transmisión de los paquetes, y la retransmisión de paquetes en caso de no recibir acuse de recibo correspondiente para un paquete determinado;a transmitter of physical layer (12a) to receive data, formatting the data received in packages, each package comprising an encoding particular and a particular data modulation, the transmission of packets, and packet retransmission in case of not receiving corresponding acknowledgment for a package determined;
- un receptor ACK (12b) para la recepción del acuse de recibo correspondiente; yan ACK receiver (12b) for the receipt of the corresponding acknowledgment of receipt; Y
- un controlador (12c) de modulación y codificación adaptativas, llamado AMC a continuación, para la recogida de las estadísticas de retransmisión mediante la recogida del número de casos de retransmisión y el ajuste de las modulaciones de datos particulares usando las estadísticas recogidas; ya controller (12c) adaptive modulation and coding, called AMC a then for the collection of relay statistics by collecting the number of retransmission cases and the adjustment of the modulations of particular data using the collected statistics; Y
- \quadquad
- un receptor (16) que tiene:a receiver (16) that has:
- un receptor de capa física (16a) para la desmodulación de los paquetes;a receiver of physical layer (16a) for the demodulation of the packages;
- un combinador y descodificador de ARQ híbrido para la combinación, almacenamiento temporal, descodificación de paquetes y la detección de errores de paquete; ya combiner and hybrid ARQ decoder for combination, storage Temporary, packet decoding and error detection of package; Y
- un transmisor de acuse de recibo (16c) para transmitir un acuse de recibo para cada paquete, si este paquete tiene una tasa de errores aceptable,a transmitter of acknowledgment (16c) to transmit an acknowledgment for each package, if this package has an error rate acceptable,
- en un canal de retroacción rápida usando una interfaz aérea de acceso múltiple por división de códigos,in a channel of Fast feedback using a multi-access aerial interface by code division,
- \quadquad
- un transmisor (12) que tiene:a transmitter (12) that has:
- medios para la recepción de datos (12a, 13);means for data reception (12a, 13);
- medios para la formación de los datos recibidos en paquetes (12a) para su transmisión al receptor (16), cada paquete comprendiendo una codificación particular y una modulación de datos particular;means for formation of the data received in packages (12a) for transmission to the receiver (16), each packet comprising a particular coding and data modulation particular;
- medios para transmitir los paquetes (12a, 12d, 13) hacia un receptor (16);means for transmit the packets (12a, 12d, 13) to a receiver (16);
- medios para retransmitir uno de los paquetes (12a, 12d, 13), si no se ha recibido acuse de recibo para este paquete; medios para recoger estadísticas de retransmisión (12c) mediante la recogida del número de casos de retransmisión; ymeans for retransmit one of the packets (12a, 12d, 13), if it has not been Received acknowledgment of receipt for this package; means to collect relay statistics (12c) by collecting the number of cases of retransmission; Y
- medios para el ajuste de cada modulación de datos particular usando las estadísticas de retransmisión recogidas (12c); ymeans for adjustment of each particular data modulation using the retransmission statistics collected (12c); Y
- \quadquad
- un receptor (16) que tiene:a receiver (16) that has:
- medios para recibir los paquetes (15, 16a); ymeans for receive the packages (15, 16a); Y
- medios para cada paquete recibido, para la descodificación y el control de errores en el paquete recibido, y para 5 generar y transmitir un acuse de recibo a la capa física, si ese paquete recibido tiene una tasa de errores aceptable (15, 16a, 16b, 16c).means for each package received, for decoding and error control in the received package, and for 5 generate and transmit an acknowledgment of receipt to the physical layer, if that received package has a rate of Acceptable errors (15, 16a, 16b, 16c).
- \quadquad
- una secuencia (36) que tiene una cola de espera (34) para la recepción de bloques de datos (34a) desde la red para el transporte en secuencia de paquetes hacia n transmisores (40-1, 40-n),a sequence (36) that has a queue (34) for receiving data blocks (34a) from the network for packet sequence transport to n transmitters (40-1, 40-n),
- \quadquad
- dicho dispositivo de destino que posee n receptores (46-1, 46-n) cada uno asociado a uno de dichos n transmisores (40-1, 40-n), n descodificadores de ARQ híbridos (50-1, 50-n) cada uno acoplado a uno de dichos n receptores (46-1, 46-n), dichos n transmisores (40-1, 40-n) transmitiendo posteriormente hacia sus n receptores asociados (46-1, 46-n) a través de un canal de datos (41),said target device that has n receivers (46-1, 46-n) each associated with one of said n transmitters (40-1, 40-n), n hybrid ARQ decoders (50-1, 50-n) each coupled to one of said n receivers (46-1, 46-n), said n transmitters (40-1, 40-n) subsequently transmitting to their n associated receptors (46-1, 46-n) a through a data channel (41),
- \quadquad
- dichos n descodificadores de ARQ híbridos (50-1, 50-n) que poseen un canal de retroacción para transmitir acuses de recibo a sus transmisores asociados (40-1, 40-n) para controlar la retransmisión y proveer una señal de acuse de recibo a su transmisor asociado (40-1, 40-n) cuando se ha recibido un paquete de tasa de errores aceptable; ysaid n hybrid ARQ decoders (50-1, 50-n) that have a channel of feedback to transmit acknowledgments to your transmitters Associates (40-1, 40-n) for control the retransmission and provide an acknowledgment signal to its associated transmitter (40-1, 40-n) when an acceptable error rate package has been received; Y
- \quadquad
- dichos n descodificadores de ARQ híbridos (50-1, 50-n) liberando paquetes que tienen una tasa de errores aceptable.said n hybrid ARQ decoders (50-1, 50-n) releasing packages that They have an acceptable error rate.
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| JP2002152259A (en) * | 2000-11-13 | 2002-05-24 | Yozan Inc | Communication terminal and charging processing unit |
| JP3588064B2 (en) * | 2001-07-13 | 2004-11-10 | 松下電器産業株式会社 | Transmitter and receiver |
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